CN211285138U - Artificial lawn convenient to drainage - Google Patents

Abstract

The utility model relates to an artificial turf convenient for drainage, which comprises a base layer, a concrete layer, a supporting layer, an elastic buffer layer and an artificial turf layer from bottom to top in sequence, wherein the artificial turf layer is detachably connected with the upper end surface of the buffer layer, the artificial turf layer comprises a plurality of artificial turf blocks which are spliced, a first connecting mechanism is arranged between two adjacent artificial turf blocks, the artificial turf blocks and the buffer layer are provided with a second connecting structure, the artificial turf blocks sequentially comprise a turf base layer, a geotextile layer laid on the turf base layer and a silk layer laid on the geotextile layer from bottom to top, the turf base layer is provided with a plurality of water permeable holes and drainage grooves which are arranged on the surface of the turf base layer and are mutually connected and communicated with the water permeable holes, the buffer layer is provided with a first drainage channel communicated with the water permeable holes, the supporting layer is provided with a second drainage channel communicated with the first drainage channel, has the advantages of rapid drainage and effective prevention of water accumulation on the surface of the lawn.

Description

Artificial lawn convenient to drainage

Technical Field

The utility model relates to an artificial turf technical field especially relates to an artificial turf convenient to drainage.

Background

The artificial turf is divided into injection-molded artificial turf and woven artificial turf according to the production process. The injection molding artificial lawn adopts an injection molding process, plastic particles are extruded and molded in a mold at one time, and the lawn is bent by a bending technology, so that grass blades are regularly arranged at equal intervals and in equal quantity, and the grass blade heights are completely uniform. It is suitable for kindergarten, playground, balcony, greening, alluvial gold, etc. The woven lawn is made up by using synthetic fibre with imitation grass leaf form, and planting it in woven base cloth, and coating layer with fixing action on its back surface to make artificial lawn on the sports field, leisure field, golf field, garden floor and greening ground.

Chinese patent No. CN205688310U discloses a drainage lawn supporting pad, which comprises a main pad, a plurality of upper protrusions, an upper drainage channel, a plurality of lower protrusions, a lower drainage channel, drainage holes and an embedded component; the upper drainage groove is arranged on the upper surface of the main base plate and penetrates between the two adjacent upper convex parts; the lower water drainage groove is arranged on the lower surface of the main base plate and penetrates between the two adjacent lower convex parts; the drain holes are uniformly distributed on the main backing plate and communicated with the upper drainage groove and the lower drainage groove; the embedded component comprises an embedded piece and an embedded groove; the embedded pieces and the embedded grooves are alternately arranged on the side edge of the main backing plate in a surrounding manner; the drainage lawn supporting pad has a drainage function and is easy to splice.

The supporting pad has the defects that the supporting pad only solves the drainage problem of water permeating into the lawn, but in practice, the artificial lawn cannot be laid smoothly when being laid, and the surface of the lawn is uneven, so that rainwater is accumulated on the surface of the artificial lawn when raining, more accumulated water exists on the artificial lawn, and the use of the artificial lawn is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an artificial turf convenient to dismouting has quick drainage, effectively prevents the advantage of lawn surface ponding.

The above technical purpose of the present invention can be achieved by the following technical solutions:

an artificial lawn convenient for drainage, which comprises a base layer, a concrete layer, a supporting layer, an elastic buffer layer and an artificial lawn layer from bottom to top in sequence, the artificial turf layer is detachably connected to the upper end face of the buffer layer, the artificial turf layer comprises a plurality of artificial turf blocks which are spliced, a first connecting mechanism is arranged between every two adjacent artificial turf blocks, the artificial turf blocks and the buffer layer are provided with second connecting structures, the artificial turf block sequentially comprises a turf base layer, a geotextile layer laid on the turf base layer and a filament layer laid on the geotextile layer from bottom to top, the lawn base layer is provided with a plurality of holes of permeating water and is seted up in lawn base layer surface and interconnect in the water drainage tank of the hole of permeating water, and the buffer layer is provided with and communicates in the first drainage channel in the hole of permeating water, and the supporting layer is provided with and communicates in the second drainage channel of first drainage channel.

Through adopting the above technical scheme, it connects in the up end of buffer layer to set up the artificial turf layer and can dismantle, the convenience is changed the artificial turf layer of damage, and original structure can not be destroyed, the lawn base layer is provided with hole and the water drainage tank of permeating water, the buffer layer is provided with first drainage channel, the supporting layer is provided with second drainage channel, water loops through the hole of permeating water, first drainage channel and second drainage channel discharge, effectively prevent that ponding from remaining in lawn base layer surface, lay the geotechnological cloth layer on lawn base layer surface, impurity to the aquatic filters, effectively prevent that impurity from getting into the hole of permeating water, first passageway and second drainage channel lead to taking place blocking phenomenon, guarantee drainage effect.

The utility model discloses further set up to: the first drainage channel comprises a plurality of drainage air bags arranged on the buffer layer, a first drainage hole formed in the upper portion of each drainage air bag and communicated with the water permeable holes, and a second drainage hole formed in the lower portion of each drainage air bag and communicated with the second drainage channel, and the transverse section of each drainage air bag is arranged in a waist shape.

By adopting the technical scheme, water enters the second drainage channel through the water permeable hole, the first drainage hole, the drainage air bag and the second drainage hole in sequence, the buffer layer has elasticity, and the drainage air bag is arranged, so that on one hand, the buffer capacity of the buffer layer is ensured, and the buffer layer has a certain protection effect, on the other hand, when people walk on a lawn, the drainage air bag is stressed and extruded to generate elastic deformation, and the water in the drainage air bag is extruded to the second drainage channel, so that the drainage efficiency is improved; the cross section of drainage gasbag is waist type setting for the buffer layer receives external power equipartition in buffer gasbag global, further improves the buffer capacity of buffer layer, improves drainage gasbag's resilience.

The utility model discloses further set up to: the inner cavity of the drainage air bag is provided with a buoyancy ball which movably seals the second drain hole, the opening of the second drain hole close to the floating ball is matched with the shape of the floating ball, the floating ball seals the second drain hole in an initial state, and after certain water is accumulated in the inner cavity of the drainage air bag, the floating ball is driven to rise, and the second drain hole is in a communicated state.

By adopting the technical scheme, the buoyancy ball is arranged, the communication and the closing of the second drain hole and the second drain channel are controlled, the second drain hole is sealed by the floating ball in the initial state, the floating ball is driven to rise after certain water is accumulated in the inner cavity of the drainage air bag, the second drain hole is in the communication state, the backflow of odor of the sewage pipeline is effectively prevented, and the environmental quality is ensured.

The utility model discloses further set up to: the second drainage channel comprises a drainage cavity, a drainage port and a drainage pipe, wherein the drainage cavity is arranged on the supporting layer and connected to the second drainage hole, the drainage port is arranged at the bottom of the side wall of the drainage cavity, the drainage pipe is communicated with the drainage port, and the bottom wall of the drainage cavity is downwards inclined towards one side close to the drainage port.

Through adopting above-mentioned technical scheme, during water in the drainage gasbag got into the drainage chamber of supporting layer through the second wash port, discharged through the drain pipe, the diapire of drainage chamber was towards being close to the downward sloping setting of outlet one side, increased the mobility of water, prevented that water from remaining in the drainage chamber.

The utility model discloses further set up to: the fixed support rack that is provided with in top that the supporting layer is located the drainage chamber, the up end butt of support rack in the lower terminal surface of buffer layer, the vertical support column that supports the rack that is provided with in drainage chamber, the junction of support column and support rack, support column and drainage chamber diapire all is provided with the strengthening rib, the strengthening rib is to the crooked arch of junction.

Through adopting above-mentioned technical scheme, the top that is located the cavity through at the supporting layer has set firmly the supporting network, and the supporting network can strengthen its support to buffer layer and artificial turf layer, prevents that buffer layer or artificial turf layer from collapsing, adds the support column, further guarantees the supporting effect, improves overall structure's intensity and stability, and arched strengthening rib has reduced the stress that the junction received, prevents that the junction stress from too concentrating.

The utility model discloses further set up to: first coupling mechanism is including offering in lawn base layer one side and being located the constant head tank on lawn base layer upper portion, offering in the constant head tank diapire and along vertical mounting groove that runs through in the constant head tank, protrusion set up in the opposite side of lawn base layer and be located the locating piece of artificial turf piece lower part, protrusion set up under the locating piece terminal surface and slide and wear to locate the installation piece of mounting groove and the spacing subassembly that the restriction installation piece slided, mutually supporting of locating piece and constant head tank.

Through adopting above-mentioned technical scheme, set up respectively in the constant head tank and the locating piece of the relative both sides in lawn base layer, constant head tank and locating piece are mutually supported, make things convenient for the installation location of two artificial turf pieces, insert the installation piece and locate the mounting groove, break away from the mounting groove through spacing subassembly restriction installation piece to realize the equipment of two adjacent artificial turf pieces.

The utility model discloses further set up to: spacing subassembly including set up in lawn base layer and communicate in the spring chamber of mounting groove, along spring chamber extending direction slide connect in the spacing ball in spring chamber, set up in the side that the installation piece is close to the spring chamber and supply the spacing groove of spacing ball activity scarf joint and place the spring chamber in and force spacing ball scarf joint in the first spring of spacing groove, the one end fixed connection of first spring in spacing ball, other end fixed connection in the lateral wall in spring chamber.

Through adopting above-mentioned technical scheme, when splitting two artificial turf pieces, only need upwards stimulate the edge of one of them artificial turf piece, force spacing groove lateral wall butt in the sphere of spacing ball, realize that spacing ball slides towards deviating from the spacing groove direction to the installation and the split of two adjacent artificial turf pieces are realized to the damping form, and are convenient fast.

The utility model discloses further set up to: the second coupling mechanism is including seting up the bar inserting groove in the up end edge of buffer layer, sets up in the bottom of inserting groove and communicates in the inserting groove hold chamber and fixed connection in the bottom of lawn base layer and peg graft in the inserting rod of inserting groove, and the width that holds the chamber is greater than the width of inserting groove, and the bottom of inserting rod has set firmly the grafting piece, and the inclined plane of being convenient for peg graft the grafting piece in the inserting groove is seted up to the bottom of grafting piece.

Through adopting above-mentioned technical scheme, the buffer layer has elasticity, and the inserted bar can be pegged graft in the inserting groove to the inserted block joint in holding the intracavity, and the inserted block joint is in holding the junction of chamber and inserting groove, prevents breaking away from of inserted bar and inserting groove, the buffer layer is fixed with artificial turf layer.

To sum up, the utility model discloses following beneficial effect has:

1. lawn base is provided with hole and the water drainage tank of permeating water, and the buffer layer is provided with first drainage channel, and the supporting layer is provided with second drainage channel, and water loops through the hole of permeating water, first drainage channel and second drainage channel discharge, prevents effectively that ponding from remaining in lawn base surface, lays the geotechnological cloth layer on lawn base surface, filters the impurity of aquatic, prevents effectively that impurity from permeating water the hole, first passageway and second drainage channel lead to taking place blocking phenomenon, guarantees drainage effect.

2. Set up the drainage gasbag, on the one hand, guarantee the buffer capacity of buffer layer, make it have certain protection effect, on the other hand, walk on the lawn as people, elastic deformation takes place for the extrusion of drainage gasbag atress, squeezes the water in the drainage gasbag to second drainage channel, improves drainage efficiency.

3. Water in the drainage gasbag passes through the second wash port and gets into the drainage chamber of supporting layer, discharges through the drain pipe, and the diapire in drainage chamber is towards being close to the downward sloping setting of outlet one side, increases the mobility of water, prevents that water from remaining in drainage chamber.

Drawings

Fig. 1 is a schematic view illustrating an overall structure of an artificial turf facilitating drainage according to an embodiment;

fig. 2 is a sectional view of an artificial lawn of an embodiment facilitating drainage;

FIG. 3 is a schematic view of the construction of a lawn substrate of an embodiment;

FIG. 4 is an enlarged partial schematic view of FIG. 2 at A;

FIG. 5 is a schematic view of the connection of an exemplary lawn substrate to a support layer;

FIG. 6 is an enlarged partial schematic view of FIG. 2 at B;

FIG. 7 is a schematic structural diagram of a support layer of an embodiment;

fig. 8 is a schematic structural view of a support column of the embodiment.

In the figure, 1, a base layer; 2. a concrete layer; 3. a support layer; 31. a support net rack; 32. a support pillar; 321. reinforcing ribs; 4. a buffer layer; 5. an artificial turf layer; 5a, artificial turf blocks; 51. a lawn base layer; 511. water permeable holes; 512. a water discharge tank; 52. a geotextile layer; 53. a layer of grass filaments; 6. a first connecting mechanism; 61. positioning a groove; 62. mounting grooves; 63. positioning blocks; 64. mounting blocks; 65. a limiting component; 651. a spring cavity; 652. a limiting ball; 653. a limiting groove; 654. a first spring; 7. a second connecting mechanism; 71. inserting grooves; 72. an accommodating chamber; 73. a plug rod; 731. an insertion block; 732. a bevel; 8. a first drain passage; 81. a first drain hole; 82. a drainage air bag; 83. a second drain hole; 84. a buoyant ball; 9. a second drain channel; 91. a drainage cavity; 92. a water outlet; 93. and a water discharge pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): an artificial lawn convenient for drainage, as shown in figure 1, comprises a base layer 1, a concrete layer 2, a supporting layer 3, an elastic buffer layer 4 and an artificial lawn layer 5 from bottom to top in sequence.

As shown in fig. 1, 2 and 3, the artificial turf layer 5 is detachably connected to the upper end surface of the buffer layer 4, the artificial turf layer 5 comprises a plurality of artificial turf blocks 5a which are spliced, and a first connecting mechanism 6 is arranged between two adjacent artificial turf blocks 5 a. The artificial turf block 5a sequentially comprises a turf base layer 51, a geotextile layer 52 laid on the turf base layer 51 and a grass layer 53 laid on the geotextile layer 52 from bottom to top, wherein the turf base layer 51 is provided with a plurality of water permeable holes 511 and drainage grooves 512 which are arranged on the surface of the turf base layer 51 and are mutually connected and communicated with the water permeable holes 511.

As shown in fig. 1 and 4, the first connecting mechanism 6 includes a positioning groove 61 disposed on one side of the lawn base layer 51 and located on an upper portion of the lawn base layer 51, an installation groove 62 disposed on a bottom wall of the positioning groove 61 and vertically penetrating through the positioning groove 61, a positioning block 63 protruding from the other side of the lawn base layer 51 and located on a lower portion of the artificial lawn block 5a, an installation block 64 protruding from a lower end surface of the positioning block 63 and slidably penetrating through the installation groove 62, and a limiting component 65 for limiting sliding of the installation block 64, wherein the positioning block 63 and the positioning groove 61 are engaged with each other.

The limiting component 65 comprises a spring cavity 651 arranged on the lawn base 51 and communicated with the mounting groove 62, a limiting ball 652 connected to the spring cavity 651 in a sliding manner along the extending direction of the spring cavity 651, a limiting groove 653 arranged on the side surface of the mounting block 64 close to the spring cavity 651 and used for movably embedding the limiting ball 652, and a first spring 654 arranged in the spring cavity 651 and used for forcing the limiting ball 652 to be embedded in the limiting groove 653, wherein one end of the first spring 654 is fixedly connected to the limiting ball 652, and the other end of the first spring 654 is fixedly connected to the side wall of the spring cavity 651.

As shown in fig. 5 and 6, the lawn base layer 51 and the buffer layer 4 are provided with a second connection structure, the second connection mechanism 7 includes a strip-shaped insertion groove 71 provided at an edge of an upper end surface of the buffer layer 4, an accommodation cavity 72 provided at a bottom of the insertion groove 71 and communicated with the insertion groove 71, and an insertion rod 73 fixedly connected to a bottom of the lawn base layer 51 and inserted into the insertion groove 71, a width of the accommodation cavity 72 is larger than a width of the insertion groove 71, a bottom of the insertion rod 73 is fixedly provided with an insertion block 731, and a slant 732 is provided at a bottom of the insertion block 731 for facilitating insertion of the insertion block 731 into the insertion groove 71.

As shown in fig. 2, the buffer layer 4 is provided with a first drainage channel 8 communicating with the water permeable holes 511, the first drainage channel 8 includes a plurality of drainage bladders 82 provided in the buffer layer 4, first drainage holes 81 provided in the upper portions of the drainage bladders 82 and communicating with the water permeable holes 511, and second drainage holes 83 provided in the lower portions of the drainage bladders 82 and communicating with the second drainage channels 9, and the transverse cross-section of the drainage bladders 82 is provided in a waist shape. The inner cavity of the drainage air bag 82 is provided with a buoyancy ball 84 which movably seals the second drainage hole 83, the opening of the second drainage hole 83 close to the floating ball is matched with the shape of the floating ball, in the initial state, the floating ball seals the second drainage hole 83, when certain water is accumulated in the inner cavity of the drainage air bag 82, the floating ball is driven to rise, and the second drainage hole 83 is in a communicated state.

As shown in fig. 2, 7 and 8, the support layer 3 is provided with a second drainage channel 9 communicated with the first drainage channel 8, the second drainage channel 9 includes a drainage chamber 91 opened in the support layer 3 and connected to the second drainage hole 83, a drainage port 92 opened in a side wall of the drainage chamber 91, and a drainage pipe 93 communicated with the drainage port 92, and a bottom wall of the drainage chamber 91 is inclined downward toward a side close to the drainage port 92. The supporting layer 3 is provided with a supporting net rack 31 at the top of the drainage cavity 91, and the upper end surface of the supporting net rack 31 abuts against the lower end surface of the buffer layer 4. Drainage chamber 91 is vertically provided with support column 32 that supports rack 31, and the junction of support column 32 and support rack 31, the junction of support column 32 and drainage chamber 91 diapire all are provided with strengthening rib 321, and strengthening rib 321 is the arch to the junction is crooked.

The working principle is as follows:

water loops through first drainage hole 81 through the hole 511 of permeating water on lawn base 51 surface, drainage gasbag 82, during second wash port 83 gets into supporting layer 3's drainage chamber 91, discharge through drain pipe 93, effectively prevent that ponding from remaining in lawn base 51 surface, lay in the geotechnological cloth layer 52 on lawn base 51 surface, filter the impurity of aquatic, effectively prevent impurity hole 511 of permeating water, first drainage channel 8 and second drainage channel 9 lead to taking place blocking phenomenon, guarantee the drainage effect.

Disassembling and assembling two adjacent artificial lawn blocks 5 a: the mounting block 64 is inserted into the mounting groove 62, when the mounting block 64 is slidably inserted into the mounting groove 62, the guide surface of the mounting block 64 abuts against the limiting ball 652, a certain force is continuously applied to force the limiting ball 652 to compress the first spring 654, the first spring 654 has elastic potential energy, and when the limiting ball 652 corresponds to the limiting groove 653 in position, the first spring 654 resets to force the limiting ball 652 to be embedded in the limiting groove 653; when the artificial turf is disassembled, the artificial turf is pulled upwards to force the limiting ball 652 to slide, and the two adjacent artificial turf blocks 5a are assembled and disassembled in a damping mode, so that the artificial turf is quick and convenient.

Disassembling and assembling the artificial turf layer 5 and the buffer layer 4: the buffer layer 4 has elasticity, the insertion rod 73 can be inserted into the insertion groove 71 until the insertion block 731 is clamped in the accommodating cavity 72, the insertion block 731 is clamped at the joint of the accommodating cavity 72 and the insertion groove 71, the insertion rod 73 is prevented from being separated from the insertion groove 71, and the buffer layer 4 is fixed with the artificial turf layer 5; pulling on the artificial turf is applied upwards, forcing the insert piece 731 to disengage from the receiving cavity 72.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws within the scope of the present invention.

Claims (8)

1. The utility model provides an artificial turf convenient to drainage which characterized by: from bottom to top include basic unit (1), concrete layer (2), supporting layer (3), have elastic buffer layer (4) and artificial turf layer (5) in proper order, artificial turf layer (5) can be dismantled and connect in the up end of buffer layer (4), artificial turf layer (5) include polylith artificial turf piece (5a) concatenation and form, are provided with first coupling mechanism (6) between two adjacent artificial turf pieces (5a), and artificial turf piece (5a) and buffer layer (4) are provided with second coupling mechanism (7), artificial turf piece (5a) includes lawn basic unit (51), lays geotechnological cloth layer (52) on basic unit (51) and lays on geotechnological cloth layer (52) from bottom to top in proper order, lawn basic unit (51) have been seted up a plurality of holes of permeating water (511) and have been seted up on lawn basic unit (51) surface and interconnect and have been put through in the drainage tank (512) of the hole of permeating water mutually, the buffer layer (4) is provided with a first drainage channel (8) communicated with the water permeable hole (511), and the support layer (3) is provided with a second drainage channel (9) communicated with the first drainage channel (8).

2. The artificial lawn facilitating drainage as claimed in claim 1, wherein: the first drainage channel (8) comprises a plurality of drainage air bags (82) arranged on the buffer layer (4), a first drainage hole (81) formed in the upper portion of the drainage air bag (82) and communicated with the water permeable hole (511), and a second drainage hole (83) formed in the lower portion of the drainage air bag (82) and communicated with the second drainage channel (9), and the transverse section of each drainage air bag (82) is arranged in a waist shape.

3. An artificial lawn facilitating drainage as claimed in claim 2, wherein: the inner cavity of the drainage air bag (82) is provided with a buoyancy ball (84) which movably seals the second drainage hole (83), the opening of the second drainage hole (83) close to the floating ball is matched with the shape of the floating ball, the floating ball seals the second drainage hole (83) in an initial state, and when certain water is accumulated in the inner cavity of the drainage air bag (82), the floating ball is driven to rise, and the second drainage hole (83) is in a communicated state.

4. An artificial lawn facilitating drainage as claimed in claim 2 or 3, wherein: the second drainage channel (9) comprises a drainage cavity (91) which is arranged on the supporting layer (3) and connected to the second drainage hole (83), a drainage port (92) which is arranged on the side wall of the drainage cavity (91) and a drainage pipe (93) which is communicated with the drainage port (92), and the bottom wall of the drainage cavity (91) is inclined downwards towards one side close to the drainage port (92).

5. An artificial lawn facilitating drainage as claimed in claim 4, wherein: the fixed support rack (31) that is provided with in top that supporting layer (3) are located drainage chamber (91), the up end butt of support rack (31) in the lower terminal surface of buffer layer (4), drainage chamber (91) vertical support column (32) that support rack (31) that are provided with, support column (32) all are provided with strengthening rib (321) with the junction of support rack (31), support column (32) and drainage chamber (91) diapire, strengthening rib (321) are to the crooked arch of junction.

6. An artificial lawn facilitating drainage as claimed in claim 5, wherein: first coupling mechanism (6) including offer in lawn base layer (51) one side and be located constant head tank (61) on lawn base layer (51) upper portion, offer in constant head tank (61) diapire and along vertical mounting groove (62) that run through in constant head tank (61), the protrusion sets up in the opposite side of lawn base layer (51) and is located locating piece (63) of artificial turf piece (5a) lower part, the protrusion sets up terminal surface under locating piece (63) and slides and wears to locate mounting block (64) of mounting groove (62) and spacing subassembly (65) that restriction mounting block (64) slided, mutually supporting of locating piece (63) and constant head tank (61).

7. An artificial lawn facilitating drainage as claimed in claim 6, wherein: spacing subassembly (65) including set up in lawn base layer (51) and communicate in spring chamber (651) of mounting groove (62), along spring chamber (651) extending direction slide connect in spacing ball (652) of spring chamber (651), set up in mounting block (64) the side that is close to spring chamber (651) and supply spacing ball (652) activity scarf joint spacing groove (653) and place in spring chamber (651) and force spacing ball (652) scarf joint first spring (654) in spacing groove (653), the one end fixed connection of first spring (654) is in spacing ball (652), and the other end fixed connection is in the lateral wall of spring chamber (651).

8. The artificial lawn facilitating drainage as claimed in claim 7, wherein: second coupling mechanism (7) are including seting up bar inserting groove (71) in the up end edge of buffer layer (4), set up in the bottom of inserting groove (71) and communicate in holding chamber (72) and fixed connection in the bottom of lawn base layer (51) and peg graft peg (73) in inserting groove (71) of inserting groove (71), the width that holds chamber (72) is greater than the width of inserting groove (71), the bottom of peg (73) has set firmly grafting piece (731), inclined plane (732) convenient to peg graft grafting piece (731) in inserting groove (71) are seted up to the bottom of grafting piece (731).

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